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Reinsurance (Notes)
9 Months Ended
Sep. 30, 2021
Reinsurance Disclosures [Abstract]  
Reinsurance [Text Block] Reinsurance
Reinsurance recoverable on ceded reinsurance
September 30, 2021December 31, 2020
(in millions of U.S. dollars)
Net Reinsurance Recoverable (1)
Valuation allowance
Net Reinsurance Recoverable (1)
Valuation allowance
Reinsurance recoverable on unpaid losses and loss expenses$15,550 $269 $14,647 $257 
Reinsurance recoverable on paid losses and loss expenses1,098 56 945 57 
Reinsurance recoverable on losses and loss expenses$16,648 $325 $15,592 $314 
Reinsurance recoverable on policy benefits$206 $4 $206 $
(1)Net of valuation allowance for uncollectible reinsurance.

The increase in reinsurance recoverable on losses and loss expenses was primarily due to higher underlying ceded exposures due to premium growth, unfavorable prior period development in certain lines, crop activity, and catastrophe losses.
The following table presents a roll-forward of valuation allowance for uncollectible reinsurance related to Reinsurance recoverable on loss and loss expenses:
Nine Months Ended
September 30
(in millions of U.S. dollars)20212020
Valuation allowance for uncollectible reinsurance - beginning of period$314 $316 
Provision for uncollectible reinsurance16 21 
Write-offs charged against the valuation allowance(4)(19)
Foreign exchange revaluation(1)
Valuation allowance for uncollectible reinsurance - end of period$325 $320 
For additional information, refer to Note 1 d) to the Consolidated Financial Statements of our 2020 Form 10-K.